<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片布局区域 -->
    <el-card class="box-card">
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center :closable="false" show-icon> </el-alert>

      <!-- 添加商品步骤显示器 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="基本图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tabs 区域 -->
      <!-- tab-position 指定 tabs 展示的位置 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="160px" class="demo-ruleForm">
        <el-tabs @tab-click="tabChange" v-model="activeIndex" tab-position="left" :before-leave="leaveHandle">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_name">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类">
              <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="addFormProps" @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的 item 项 -->
            <el-form-item :label="item.attr_name" v-for="(item, index) in manyData" :key="index">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" size="mini" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="(item, index) in onlyData" :key="index">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action 表示图片要上传到后台的API地址 -->
            <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess" multiple>
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">商品内容</el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewDialogVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'AddGoods',
  data() {
    return {
      activeIndex: '0',
      // 添加表单绑定的数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        pics: [] // 图片的数组
      },
      // 添加表单验证规则
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }]
      },
      // 商品分类列表数据
      cateList: [],
      // 级联选择器的配置选项
      addFormProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 动态参数列表数据
      manyData: [],
      // 静态属性列表数据
      onlyData: [],
      // 上传图片的URL地址
      uploadURL: 'http://192.168.19.64:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 预览图片的地址
      previewPath: '',
      // 控制图片预览对话框的显示与隐藏
      previewDialogVisible: false
    }
  },
  created() {
    // 调用获取所有商品分类数据的方法
    this.getCateData()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateData() {
      const { data: res } = await this.$http.get('/categories')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.cateList = res.data
    },

    // 级联选择器改变之后触发
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },

    // 监听 tabs 有没有切换，切换之前触发这个方法
    leaveHandle(activeName, oldActiveName) {
      // console.log(activeName, oldActiveName)
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择分类')
        return false
      }
    },

    // tab 被选中时触发函数
    async tabChange() {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`/categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)

        // 处理数据 attr_vals ，将其从 字符串形式 转为 数组形式
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })

        this.manyData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`/categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)

        // 处理数据 attr_vals ，将其从 字符串形式 转为 数组形式
        // res.data.forEach(item => {
        //   item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        // })

        this.onlyData = res.data
      }
    },

    // 处理图片的预览效果
    handlePreview(file) {
      // 参数file表示 将要预览的图片文件信息
      // console.log(file)

      this.previewPath = file.url
      this.previewDialogVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // 第一个参数表示 将要被移除的图片文件信息
      // console.log(file)

      // 1. 获取将要被移除的图片的临时路径
      const removeImg = file.response.data.tmp_path
      // 2. 从 pics 数组中找到这个图片对应的索引值
      const index = this.addForm.pics.findIndex(item => {
        return item.pic === removeImg
      })
      // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
      this.addForm.pics.splice(index, 1)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // console.log(response)
      const picInfo = { pic: response.data.tmp_path }
      // console.log(picInfo)
      this.addForm.pics.push(picInfo)
      // console.log(this.addForm.pics)
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-steps {
  margin: 15px 0;
}

/deep/ .el-step__title {
  font-size: 13px;
}

/deep/ .el-checkbox {
  margin: 8px 10px 0 0 !important;
}

.previewImg {
  width: 100%;
}
</style>
